Management of labor will be according the labor and delivery standard protocol, if labor dilatation will not progress appropriately, i.e. cervical dilatation rate of <1cm/hour, amniotomy will be performed if membranes are intact. Oxytocin augmentation will be considered after rupture of membranes only if the cervix remains unchanged on two consecutive pelvic examination conducted two hours apart. Oxytocin infusion will start with 5mIU/min and increase by 5mIU/min every 15min to achieve seven contractions in 15 min, the maximal rate of oxytocin being 30Miu/min.